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Of what Elements Each of the Members of Us Men is Composed.
Empedocles says, that the fleshy parts of us are constituted by the contemperation of the four elements in us; earth and fire mixed with a double proportion of water make nerves; but when it happens that the nerves are refrigerated where they come in contact with the air, then the nails are made; the bones are produced by two parts of water and the same of air, with four parts of fire and the same of earth, mixed together; sweat and tears flow from liquefaction of bodies.
What are the Causes of Sleep and Death?
Alcmaeon says, that sleep is caused when the blood retreats to the concourse of the veins, but when the blood diffuses itself then we awake and when there is a total retirement of the blood, then men die. Empedocles, that a moderate cooling of the blood causeth sleep, but a total remotion of heat from blood causeth death. Diogenes, that when all the blood is so diffused as that it fills all the veins, and forces the air contained in them to the back and to the belly that is below it, the breast being thereby more heated, thence sleep arises, but if everything that is airy in the breast forsakes the veins, then death succeeds. Plato and the Stoics, that sleep ariseth from the relaxation of the sensitive spirit, it not receiving such total relaxing as if it fell to the earth, but so that that spirit is carried about the intestine, parts of the eyebrows, in which the principal part has its residence; but when there is a total relaxing of the sensitive spirit, death ensues.
When and from Whence the Perfection of a Man Commences.
Heraclitus and the Stoics say, that men begin their completeness when the second septenary of years begins, about which time the seminal serum is emitted. Trees first begin their perfection when they give their seeds; till then they are immature, imperfect, and unfruitful. After the same manner a man is completed in the second septenary of years, and is capable of learning what is good and evil, and of discipline therein.
Whether Sleep or Death Appertains to the Soul or Body.
Aristotle’s opinion is, that both the soul and body sleep; and this proceeds from the evaporation in the breast, which doth steam and arise into the head, and from the aliment in the stomach, whose proper heat is cooled in the heart. Death is the perfect refrigeration of all heat in body; but death is only of the body, and not of the soul, for the soul is immortal. Anaxagoras thinks, that sleep makes the operations of the body to cease; it is a corporeal passion and affects not the soul. Death is the separation of the soul from the body. Leucippus, that sleep is only of the body; but when the smaller particles cause excessive evaporation from the soul’s heat, this makes death; but these affections of death and sleep are of the body, not of the soul. Empedocles, that death is nothing else but separation of those fiery parts by which man is composed, and according to this sentiment both body and soul die; but sleep is only a smaller separation of the fiery qualities.
How Plants Increase.
Plato and Empedocles believe, that plants are animals, and are informed with a soul; of this there are clear arguments, for they have tossing and shaking, and their branches are extended; when the woodmen bend them they yield, but they return to their former straightness and strength again when they are let loose, and even carry up weights that are laid upon them. Aristotle doth grant that they live, but not that they are animals; for animals are affected with appetite, sense, and reason. The Stoics and Epicureans deny that they are informed with a soul; by reason that all sorts of animals have either sense, appetite, or reason; but plants act fortuitously, and not by means of any soul. Empedocles, that the first of all animals were trees, and they sprang from the earth before the sun in its motion enriched the world, and before day and night were distinguished; but by the harmony which is in their constitution they partake of a masculine and feminine nature; and they increase by that heat which is exalted out of the earth, so that they are parts belonging to it, as embryos in the womb are parts of the womb. Fruits in plants are excrescences proceeding from water and fire; but the plants which lack water, when this is dried up by the heat of summer, shed their leaves; whereas they that have plenty thereof keep their leaves on, as the olive, laurel, and palm. The differences of their moisture and juice arise from the difference of particles and various other causes, and they are discriminated by the various particles that feed them. And this is apparent in vines for the excellence of wine flows not from the difference in the vines, but from the soil from whence they receive their nutriment.
Of Nutrition and Growth.
Empedocles believes, that animals are nourished by the remaining in them of that which is proper to their own nature; they are augmented by the application of heat; and the subtraction of either of these makes them to languish and decay. The stature of men in this present age, if compared with the magnitude of those men which were first produced, is only a mere infancy.
Whence it is that in Animals There are Appetites and Pleasures.
Empedocles says that the want of those elements which compose animals gives to them appetite, and pleasures spring from humidity. As to the motions of dangers and such like things as perturbations, etc. . . .
What is the Cause of a Fever, or Whether it is an Affection of the Body Annexed to a Primary Passion
Erasistratus gives this definition of a fever: A fever is a quick motion of blood, not produced by our consent, which enters into the vessels, the seat of the vital spirits. This we see in the sea; it is in a serene calm when nothing disturbs it, but is in motion when a violent preternatural wind blows upon it, and then it rageth and is circled with waves. After this manner it is in the body of man; when the blood is in a nimble agitation, then it falls upon those vessels in which the spirits are, and there being in an extraordinary heat, it fires the whole body. The opinion that a fever is an appendix to a preceding affection pleaseth him. Diocles proceeds after this manner: Those things which are internal and latent are manifested by those which externally break forth and appear; and it is clear to us that a fever is annexed to certain outward affections, for example, to wounds, inflaming tumors, inguinary abscesses.
Of Health, Sickness, and Old Age.
Alcmaeon says that the preserver of health is an equal proportion of the qualities of heat, moisture, cold, dryness, bitterness, sweetness, and the other qualities; on the contrary, the prevailing empire of one above the rest is the cause of diseases and author of destruction. The direct cause of disease is the excess of heat or cold, the formal cause is excess or defect, the place is the blood or brain. But health is the harmonious commixture of the elements. Diocles, that sickness for the most part proceeds from the irregular disposition of the elements in the body, for that makes an ill habit or constitution of it. Erasistratus, that sickness is caused by the excess of nourishment, indigestion, and corruptions; on the contrary, health is the moderation of the diet, and the taking that which is convenient and sufficient for us. It is the unanimous opinion of the Stoics that the want of heat brings old age, for (they say) those persons in whom heat more abounds live the longer. Asclepiades, that the Ethiopians soon grow old, and at thirty years of age are ancient men, their bodies being excessively heated and scorched by the sun; in Britain persons live a hundred and twenty years, on account of the coldness of the country, and because the people keep the fiery element within their bodies; the bodies of the Ethiopians are more fine and thin, because they are relaxed by the sun’s heat, while they who live in northern countries are condensed and robust, and by consequence are more long lived.
The End